Brazil Leader's Support Drops Dramatically, Poll Shows

Poor Poll Raises Questions About Ms. Rousseff's Ability to Push Through Her Political Agenda

By

John Lyons

Updated June 30, 2013 8:04 p.m. ET

SÃO PAULO—In a deepening of Brazil's political crisis, President Dilma Rousseff's approval rating has plunged, weakening her ability to push the reform measures her administration sees as an antidote to weeks of middle-class unrest against Brazil's political elites.

Ms. Rousseff's approval rating fell 27 percentage points to 30% in the three weeks since mass protests against everything from poor bus services to the high cost of...